The Generac 6338 50-Amp 125/250-Volt Rain tight Power Inlet Box installs on the exterior of your house or building and is hard wired to your transfer switch. Use a power inlet box when you need to plug in your generator outdoors to connect to a transfer switch indoors. This power inlet box is made of NEMA 3R-rated non-metallic resin which provides for long life and includes 6 knockouts for ultimate wiring flexibility. During a power outage you connect your 12500-Watt maximum generator to this NEMA configuration CS6365 power inlet box with a Generac power cord. Power inlet box is compatible with generators with 50-Amp outlets including model numbers: GP15000E, GP17500E, XG10000E and XP10000E. Also combatable with Generac transfer switches model numbers: 6380, 6381 and 6335. The Generac 6338 50-Amp 125/250-Volt Rain tight Power Inlet Box is UL Listed, made in the USA, backed by a 2-year limited **and measures 6-inch by 5-inch by 5-inch and weighs 2-pounds. Generac power inlet boxes should be installed by a professional electrician familiar with electrical wiring and code. Generac manufactures the widest range of power products in the marketplace including portable, RV, residential, commercial and industrial generators. Generac also operates three large factories that employ thousands of workers in the American Midwest.